Jacob Scheffer was a son of Manuel Scheffer and Keetje Moscoviter. He married in Amsterdam on 21 August 1929 to Esther Goudeketting, daughter of Levie Goudeketting and Elisabeth Levee. website www.wiewaswie.nl.
In addition, a Jokos file (number 005198) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.